Abstract
The paper describes fatigue rigs developed at the Admiralty Engineering Laboratory, West Drayton, to test single-throw crank test pieces cut from multi-throw diesel engine crankshafts under bending and under torsion. Both rigs operated at resonance with slipping clutch excitation. The pieces tested under torsion indicated a fatigue limit for failure at the oil hole under a stress range equal to the tensile strength of the material; the effects of imperfect finish to the oil hole surface and of non-metallic inclusions in the material were also shown. The fatigue limit under bending corresponded to a stress range in the fillet somewhat less than the tensile strength; possible reasons for this are suggested.
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